单项选择题

He ______ into the office building when the fire bell rang.

A. goes
B. has gone
C. was going
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单项选择题
—Will you come for the meeting —Yes, of course, if you think ______.
A. I come
B. I go
C.I should
单项选择题
Can I ______ your dictionary for a minute I left mine at home.
A. borrow
B. lend
C. keep
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